WO2017002394A1

WO2017002394A1 - Bumper reinforcement

Info

Publication number: WO2017002394A1
Application number: PCT/JP2016/055618
Authority: WO
Inventors: 洋康小坂; 和章北口; 義章東
Original assignee: 豊田鉄工株式会社
Priority date: 2015-07-01
Filing date: 2016-02-25
Publication date: 2017-01-05
Also published as: JP2017013634A; JP6403279B2

Abstract

Provided is a bumper reinforcement that is capable improving the peak load and the amount of energy absorption per unit mass by suppressing cross-sectional deformation of a so-called inverted-hat type closed cross-section. The bumper reinforcement 1 is provided with an upper reinforcement body 10A and a lower reinforcement body 10B that are disposed inside a long box body 2 at a longitudinal center of the long box body 2. An upper rear surface 21A of the upper reinforcement body 10A and a lower rear surface 21B of the lower reinforcement body 10B are fixed to a rear surface 4 of the long box body 2. An upper surface 24 of the upper reinforcement body 10A faces an upper surface 5 of the long box body 2 in the vicinity of the upper surface 5 of the long box body 2. A lower surface 25 of the lower reinforcement body 10B faces a lower surface 6 of the long box body 2 in the vicinity of the lower surface 6 of the long box body 2. An upper front surface 26A of the upper reinforcement body 10A and a lower front surface 26B of the lower reinforcement body 10B are fixed to a long front plate 3.

Description

Bumper reinforcement

The present invention relates to bumper reinforcement that absorbs vehicle collision energy.

Conventionally, bumper reinforcement that absorbs collision energy has been used for vehicles in order to ensure safety in the event of a vehicle collision.

Specifically, for example, in Patent Document 1 below, bumper reinforcement composed of a long cylindrical body that is provided extending in the width direction of the automobile body is proposed at the front of the automobile body. In the bumper reinforcement described in Patent Document 1, the center in the longitudinal direction of the cylinder is the upper surface and the lower surface, and the front surface (collision surface) and the rear surface in the front-rear direction of the vehicle body that intersects the upper surface and the lower surface at right angles or inclines. Anti-collision surface) in the front-rear direction of the vehicle body, and a so-called hat-shaped closed cross-sectional shape having outward flanges on the upper surface and the lower surface.

Further, in Patent Document 1, a material having a hat-shaped open cross-sectional shape shown in FIG. 1 of Patent Document 1 (hereinafter referred to as “hat-shaped open cross-sectional material”) and a flat cross-section using general-purpose dynamic finite element method analysis software. Resistance of a hat-shaped closed cross-section member (hereinafter referred to as a “hat member”) assembled by spot welding by overlapping a material (hereinafter also referred to as a plate-shaped material) on the outward flange at the edge of the hat-shaped open cross-section material. Bending performance and crushing performance (impact energy absorption performance) are obtained by analysis.

Furthermore, in Patent Document 1, when the impactor is caused to collide from the hat-shaped open cross-section material side, that is, in the case shown in FIGS. 2 and 3 of Patent Document 1, a hat member (hereinafter referred to as “forward hat cross-section member”), a plate Bending resistance and impact energy absorption performance of the hat member (hereinafter referred to as “reverse hat cross-section member”) when the impactor is collided from the side of the sheet material is investigated by three-point bending collision analysis and crush analysis .

According to the results shown in the graph of FIG. 4 of Patent Document 1, the reverse hat cross-section member has higher bending strength because it has higher resistance to deformation of the cross-sectional shape at the time of collision, compared to the forward hat cross-section member.

Japanese Patent No. 5168023

However, according to the result shown by the graph in FIG. 5 of Patent Document 1, the plate-shaped material is not joined to the reverse hat cross-section member, and deformation occurs from the hat top side of the hat-shaped open cross-section material. It cannot be said that the impact energy absorption performance is better than that of the hat cross-section member.

Therefore, the present invention has been made in view of the above-described points, and by suppressing the collapse of the so-called reverse hat type closed cross-sectional shape, it is possible to improve the peak load and the amount of energy absorption per unit mass. The challenge is to provide possible bumper reinforcement.

The bumper reinforcement according to claim 1, which has been made in order to solve this problem, is provided with a reinforcing body inside a closed cross section formed from a long box and a long front plate, A bumper reinforcement installed in a direction in which a face plate side is a load input side, wherein the reinforcing body includes a first upper surface, a first lower surface, a first rear surface, and the long front plate of the elongated box. And is fixed to at least the first rear surface and the long front plate of the long box body.

The bumper reinforcement according to claim 2 is the bumper reinforcement according to claim 1, wherein the long box body is opened at a first front surface covered with the long front plate, and the first The first rear surface provided facing the front surface, the first upper surface extending from the upper side of the first rear surface toward the first front surface, and the first front surface from the lower side of the first rear surface The first lower surface provided to face the first upper surface and extending upward from the first front surface side of the first upper surface; and a first upper flange extending upward from the first front surface side of the first upper surface; A first lower flange extending downward from the first front surface side of the first lower surface; and the elongate front plate includes the first upper flange of the elongate box and the first lower flange. The first lower flange is fixed, and the reinforcing body includes a second rear surface, 2 an upper inclined surface extending obliquely upward from the upper side of the rear surface, a lower inclined surface extending obliquely downward from the lower side of the second rear surface, and extending from the upper side of the upper inclined surface. A second upper surface provided, a second lower surface extending from the lower inclined surface and facing the second upper surface, and a front side of the second upper surface from the second upper surface to the second lower surface. And a second front surface extending from the front side of the second lower surface toward the second upper surface, the long box body at the center in the longitudinal direction of the long box body The second rear surface of the reinforcing body is opposed to the first rear surface of the elongated box and is fixed to the first rear surface of the elongated box, The second upper surface opposes the first upper surface of the elongated box in the vicinity of the first upper surface of the elongated box, and the reinforcement The second lower surface of the elongated box body is opposed to the first lower surface of the elongated box body in the vicinity of the first lower surface of the elongated box body, and the second front surface of the reinforcing body is the front of the elongated box body. It faces the face plate and is fixed to the long front plate.

The bumper reinforcement according to claim 3 is the bumper reinforcement according to claim 2, wherein the reinforcing body includes an upper reinforcing body and a lower reinforcing body, and the upper reinforcing body is formed on the second rear surface. An upper second rear surface corresponding to a substantially upper half, the upper inclined surface, the second upper surface, and an upper second front surface substantially corresponding to an upper half of the second front surface; A lower second rear surface corresponding to a substantially lower half of the second rear surface, the lower inclined surface, the second lower surface, and a lower second front surface corresponding to a substantially lower half of the second front surface. The upper second rear surface of the upper reinforcing member and the lower second rear surface of the lower reinforcing member are fixed to the first rear surface of the elongated box, and the upper second front surface of the upper reinforcing member. And the lower second front surface of the lower reinforcing body is fixed to the elongated front plate. And features.

In the bumper reinforcement of the invention according to claim 3, in order to ensure that the second rear surface of the reinforcement body is fixed to the first rear surface of the elongated box body, The upper second rear surface and the lower second rear surface of the lower reinforcing body are fixed to the first rear surface of the elongated box. Further, in order to ensure that the second front surface of the reinforcing body is fixed to the elongated front plate, the upper second front surface of the upper reinforcing body and the lower second front surface of the lower reinforcing body. Is fixed to the elongated front plate.

The invention according to claim 4 is the bumper reinforcement according to claim 2, wherein the reinforcing body is a solid body made of synthetic resin.

In the bumper reinforcement according to the first aspect of the present invention, a reinforcing body is provided inside a closed cross section formed from a long box and a long front plate, and the long front plate side is a load input side. Installed in the direction. Therefore, the bumper reinforcement according to the first aspect of the present invention has a so-called reverse hat type closed cross-sectional shape. Furthermore, in the bumper reinforcement according to the first aspect of the present invention, the reinforcing body is disposed so as to face the first upper surface, the first lower surface, the first rear surface, and the long front plate of the long box body in close proximity. And is fixed to at least the first rear surface of the elongated box and the elongated front plate. With such a configuration, when a collision occurs on the long front plate side, the first upper surface and the first lower surface of the long box body are elongated from the long front plate side where the collision has occurred. It deforms inside the box and abuts against the reinforcement. That is, in the long box, the first upper surface and the first lower surface of the long box are deformed from the long front plate side to the inside of the long box, but the inner deformation is obstructed by the reinforcing body. Therefore, the cross-sectional collapse is suppressed. Therefore, the bumper reinforcement of the invention according to claim 1 can improve the peak load and the energy absorption amount per unit mass by suppressing the collapse of the cross section of the so-called reverse hat type closed cross section.

In the bumper reinforcement of the invention according to claim 2, the first front surface of the long box is opened, while the long front plate is provided on the first upper flange and the first lower flange of the long box. Fixed. Therefore, the bumper reinforcement of the invention according to claim 2 has a so-called reverse hat type closed cross-sectional shape.

Furthermore, the bumper reinforcement of the invention according to claim 2 includes a reinforcing body provided in the elongated box at the center in the longitudinal direction of the elongated box, and the second rear surface of the reinforcing body is The long box is opposed to the first rear surface of the long box and is fixed to the first rear surface of the long box, and the second upper surface of the reinforcing body is in the vicinity of the first upper surface of the long box. The second lower surface of the reinforcement body is opposed to the first lower surface of the elongated box body in the vicinity of the first lower surface of the elongated box body, and the second front surface of the reinforcement body is elongated. Opposite the front plate and fixed to the long front plate.

With such a configuration, when a collision occurs in the long front plate at the center in the long direction of the long box, the first of the reinforcing body of the first upper surface and the first lower surface of the long box. 2 The portion located near the upper surface or the second lower surface is deformed from the side of the long front plate where the collision has occurred to the inside of the long box, so that it touches the second upper surface or the second lower surface of the reinforcing body. Touch. That is, at the center in the longitudinal direction of the long box, the first upper surface and the first lower surface of the long box are deformed from the long front plate side to the inside of the long box, but the inner deformation Is hindered by the second upper surface and the second lower surface of the reinforcing body, so that the collapse of the cross section is suppressed. Therefore, the bumper reinforcement of the invention according to claim 2 can improve the peak load per unit mass and the amount of energy absorption by suppressing the cross-sectional collapse of the so-called reverse hat type closed cross-sectional shape.

In the bumper reinforcement of the invention according to claim 3, the reinforcing body is composed of an upper reinforcing body and a lower reinforcing body. The upper reinforcing body has an upper second rear surface corresponding to substantially the upper half of the second rear surface, an upper inclined surface, a second upper surface, and an upper second front surface corresponding to the substantially upper half of the second front surface. The lower reinforcing body includes a lower second rear surface corresponding to a substantially lower half of the second rear surface, a lower inclined surface, a second lower surface, and a lower second front surface corresponding to a substantially lower half of the second front surface. Have. With such a configuration, the upper reinforcing body and the lower reinforcing body are symmetrical. Therefore, in the bumper reinforcement of the invention according to claim 3, since the upper reinforcing body and the lower reinforcing body constituting the reinforcing body can be formed in the same shape, the reinforcing body can be easily manufactured and the manufacturing cost can be reduced. It is.

In the bumper reinforcement of the invention according to claim 4, the reinforcing body is a solid body made of a synthetic resin, and the burden of the work of assembling the reinforcing body is reduced. Therefore, the reinforcing body is formed from a long box and a long front plate. The reinforcing body can be easily provided inside the closed cross section.

It is a perspective view showing the bumper reinforcement which concerns on this embodiment. It is a perspective view showing the elongate box of the bumper reinforcement. It is a top view showing the bumper reinforcement. It is a perspective view showing the elongate box body and reinforcement body of 1st Embodiment. FIG. 2 is a cross-sectional view of the elongated box, the elongated front plate, and the reinforcing body of the first embodiment cut along line BB in FIG. FIG. 3 is a cross-sectional view of the long box, the long front plate, and the reinforcing body of the first embodiment cut along the line BB in FIG. 1 and shows the three-point bending collision analysis result of the first embodiment. FIG. It is a figure showing the result (relationship of a deformation amount, a load, and energy absorption amount) of the three-point bending collision analysis of 1st Embodiment. It is a perspective view showing the elongate box and reinforcement body of 2nd Embodiment. FIG. 5 is a cross-sectional view of the long box, the long front plate, and the reinforcing body of the second embodiment cut along line BB in FIG. FIG. 4 is a cross-sectional view of the long box, the long front plate, and the reinforcing body of the second embodiment cut along the line BB in FIG. 1 and shows the three-point bending collision analysis result of the second embodiment. FIG. It is a figure showing the result (relationship of a deformation amount, a load, and energy absorption amount) of the three-point bending collision analysis of 2nd Embodiment. FIG. 3 is a cross-sectional view of a long box and a long front plate of a comparative example cut along line BB in FIG. FIG. 3 is a cross-sectional view of the long box body and the long front plate of the comparative example cut along line BB in FIG. 1 and is a view showing the result of the three-point bending collision analysis of the comparative example. It is the figure which compared the three-point bending collision analysis result (peak load / mass ratio) with the comparative example, 1st Embodiment, and 2nd Embodiment. It is the figure which compared the three-point bending collision analysis result (energy absorption amount / mass ratio) with the comparative example, 1st Embodiment, and 2nd Embodiment. It is a perspective view showing the elongate box and reinforcement body of 3rd Embodiment. FIG. 9 is a cross-sectional view of the long box, the long front plate, and the reinforcing body of the third embodiment cut along line BB in FIG. FIG. 6 is a cross-sectional view of the elongated box, the elongated front plate, and the reinforcing body of the fourth embodiment cut along line CC or line DD of FIG. 3, wherein (a) is an assembly of the reinforcing body. It is a figure showing a process, (b) is a figure showing a joining process of a long front board to a long box, and (c) is painting of a long box and a long front board. It is a figure showing a process.

[1. Common configuration of each embodiment]
The bumper reinforcement according to the present invention will be described in detail with reference to the drawings based on a specific embodiment. As shown in FIG. 1, the bumper reinforcement 1 according to the present embodiment has a curved shape in which both ends in the longitudinal direction are retreated, and includes a long box 2 and a long front plate 3. The long box 2 and the long front plate 3 are made of steel.

As shown in FIG. 2, the elongated box 2 includes a rear surface 4, an upper surface 5, a lower surface 6, an upper flange 7, a lower flange 8, and an opening front surface 9.

In the long box 2, the opening front 9 is opened. The rear surface 4 is provided to face the opening front surface 9. The upper surface 5 extends from the upper side of the rear surface 4 toward the opening front surface 9. The lower surface 6 extends from the lower side of the rear surface 4 toward the opening front surface 9 and is provided to face the upper surface 5. The upper flange 7 extends upward from the opening front surface 9 side of the upper surface 5. A lower flange 8 extends downward from the opening front 9 side of the lower surface 6.

As shown in FIGS. 1 and 2, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. Spot welding is used for the joining.

In the bumper reinforcement 1 according to the present embodiment, as shown in FIG. 3, the reinforcing body 10 is installed in the long box 2 at the center A in the long direction of the long box 2.

In the bumper reinforcement 1 according to the present embodiment, four reinforcing bodies 10 which are different modes are used. Hereinafter, the bumper reinforcement 1 according to the present embodiment will be described by dividing it into a first embodiment, a second embodiment, a third embodiment, and a fourth embodiment according to the aspect of the reinforcing body 10. In the description of each embodiment, the same reference numerals are given to portions common to the bumper reinforcement 1 according to the present embodiment.

[2. First Embodiment]
First, the first embodiment will be described. In the first embodiment, as shown in FIG. 4, the reinforcing body 10 is installed in the long box 2 at the center A in the long direction of the long box 2.

The reinforcing body 10 is made of steel in the same manner as the long box 2 and the long front plate 3. The reinforcing body 10 includes an upper reinforcing body 10A and a lower reinforcing body 10B. The upper reinforcing body 10A and the lower reinforcing body 10B are press-formed products by bending, have a symmetrical shape, and are provided with spacing regions S1 and S2 along the long direction of the long box 2. In the state, it is installed in the long box 2.

As shown in FIGS. 4 and 5, the upper reinforcing body 10A is a semi-cylindrical body and includes an upper rear surface 21A, an upper inclined surface 22, an upper surface 24, and an upper front surface 26A.

In the upper reinforcing body 10A, the upper inclined surface 22 extends obliquely upward from the upper side of the upper rear surface 21A. The upper surface 24 extends from the upper side of the upper inclined surface 22. The upper front surface 26A extends downward from the upper surface 24 and is provided to face the upper rear surface 21A.

The lower reinforcing body 10B is a semi-cylindrical body as shown in FIGS. 4 and 5, and includes a lower rear surface 21B, a lower inclined surface 23, a lower surface 25, and a lower front surface 26B.

In the lower reinforcing body 10B, the lower inclined surface 23 extends obliquely downward from the lower side of the lower rear surface 21B. The lower surface 25 extends from the lower side of the lower inclined surface 23 and is provided to face the upper surface 24 of the upper reinforcing body 10A. The lower front surface 26B extends upward from the lower surface 25 and is provided to face the lower rear surface 21B.

As shown in FIG. 5, the upper rear surface 21A of the upper reinforcing body 10A is opposed to the rear surface 4 of the long box body 2, and the rear surface 4 of the long box body 2 is formed by spot welding at the welding point P1. Fixed to. The upper side of the upper inclined surface 22 of the upper reinforcing body 10 A is located in the vicinity of the upper surface 5 of the long box 2. The upper surface 24 of the upper reinforcing body 10 A faces the upper surface 5 of the long box 2 in the vicinity of the upper surface 5 of the long box 2. The upper front surface 26A of the upper reinforcing body 10A faces the long front plate 3 and is fixed to the long front plate 3 by spot welding at the welding point P2.

The lower rear surface 21B of the lower reinforcing body 10B faces the rear surface 4 of the elongated box 2 and is attached with a first predetermined distance downward from the lower side of the upper rear surface 21A of the upper reinforcing body 10A. It is fixed to the rear surface 4 of the elongated box 2 by spot welding at the welding point P3. By this fixing, the spacing region S1 is provided along the long direction of the long box 2. The lower side of the lower inclined surface 23 of the lower reinforcing body 10B is located in the vicinity of the lower surface 6 of the elongated box 2. The lower surface 25 of the lower reinforcing body 10 B faces the lower surface 6 of the long box 2 in the vicinity of the lower surface 6 of the long box 2. The lower front surface 26B of the lower reinforcing body 10B is opposed to the long front plate 3, and is attached with a first predetermined distance downward from the lower side of the upper front surface 26A of the upper reinforcing body 10A. It is fixed to the long front plate 3 by spot welding at P4. By this fixing, the spacing region S2 is provided along the long direction of the long box 2.

As described above, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. For the joining, spot welding at welding locations P5 and P6 is used.

Finite element analysis software (trade name: PAM-CRASH 64-Bit Solvers
2012. 1), the three-point bending collision analysis of the first embodiment was performed. In the three-point bending collision analysis, as shown in FIG. 3, a collision load L was applied to the long front plate 3 at the center A in the long direction of the long box 2.

According to the analysis result, in the cross section cut at the longitudinal center A (that is, the line BB in FIG. 1) of the long box body 2, when the amount of deformation becomes maximum, as shown in FIG. Furthermore, a portion 27 of the upper surface 5 of the elongated box 2 that faces the upper surface 24 of the upper reinforcing body 10A is deformed inside the elongated box 2 and abuts on the upper surface 24 of the upper reinforcing body 10A. Yes. A portion 28 of the lower surface 6 of the long box 2 that faces the lower surface 25 of the lower reinforcing body 10B is deformed inside the long box 2 and abuts on the lower surface 25 of the lower reinforcing body 10B. Yes. On the other hand, the upper surface 24 of the upper reinforcing body 10A and the lower surface 25 of the lower reinforcing body 10B are less deformed in the vertical direction.

As shown in FIG. 7, in the first embodiment, the load [kN] increases in proportion to the first predetermined deformation amount [mm], and after the first predetermined deformation amount [mm], The load [kN] is substantially constant. Therefore, the energy absorption amount [kJ] increases so as to be approximately linearly proportional to the deformation amount [mm].

[3. Second Embodiment]
Next, a second embodiment will be described. In the second embodiment, as shown in FIG. 8, the reinforcing body 10 is installed in the long box 2 at the center A in the long direction of the long box 2.

The reinforcing body 10 is made of steel in the same manner as the long box 2 and the long front plate 3. The reinforcing body 10 includes an upper reinforcing body 10C and a lower reinforcing body 10D. The upper reinforcing body 10C and the lower reinforcing body 10D are press-formed products by bending, have a symmetrical shape, and are provided with overlapping regions G1 and G2 along the long direction of the long box body 2. In the state, it is installed in the long box 2.

As shown in FIGS. 8 and 9, the upper reinforcing body 10C is a semi-cylindrical body and includes an upper rear surface 21C, an upper inclined surface 22, an upper surface 24, and an upper front surface 26C.

In the upper reinforcing body 10C, the upper inclined surface 22 extends obliquely upward from the upper side of the upper rear surface 21C. The upper surface 24 extends from the upper side of the upper inclined surface 22. The upper front surface 26C extends downward from the upper surface 24 and is provided to face the upper rear surface 21C.

As shown in FIGS. 8 and 9, the lower reinforcing body 10D is a semi-cylindrical body, and includes a lower rear surface 21D, a lower inclined surface 23, a lower surface 25, and a lower front surface 26D.

In the lower reinforcing body 10D, the lower inclined surface 23 extends obliquely downward from the lower side of the lower rear surface 21D. A lower surface 25 extends from the lower side of the lower inclined surface 23 and is provided to face the upper surface 24 of the upper reinforcing body 10C. The lower front surface 26D extends upward from the lower surface 25 and is provided to face the lower rear surface 21D.

As shown in FIG. 9, the upper rear surface 21 C of the upper reinforcing body 10 C faces the rear surface 4 of the long box 2. The upper side of the upper inclined surface 22 of the upper reinforcing body 10 C is located in the vicinity of the upper surface 5 of the long box 2. The upper surface 24 of the upper reinforcing body 10 C faces the upper surface 5 of the long box body 2 in the vicinity of the upper surface 5 of the long box body 2. The upper front surface 26 C of the upper reinforcing body 10 C faces the elongate front plate 3.

The lower rear surface 21D of the lower reinforcing body 10D faces the rear surface 4 of the long box 2. The lower side of the lower inclined surface 23 of the lower reinforcing body 10D is located in the vicinity of the lower surface 6 of the elongated box 2. The lower surface 25 of the lower reinforcing body 10 D faces the lower surface 6 of the long box 2 in the vicinity of the lower surface 6 of the long box 2. A lower front surface 26D of the lower reinforcing body 10D faces the elongated front plate 3.

The upper rear surface 21C of the upper reinforcing body 10C is attached in a state where the lower rear surface 21D of the lower reinforcing body 10D is overlapped on the rear surface 4 side of the elongated box 2 from the lower side to the upper second predetermined distance. By the spot welding at the welding point P7, it is fixed to the rear surface 4 of the elongated box body 2 together with the lower rear surface 21D of the lower reinforcing body 10D. By this fixing, the overlapping region G1 is provided along the long direction of the long box 2. The lower front surface 26D of the lower reinforcing body 10D is attached in a state where the upper front surface 26C of the upper reinforcing body 10C is overlapped on the long front plate 3 side from the upper side to the second predetermined distance below, and the welding point P8 is attached. Is fixed to the long front plate 3 together with the upper front surface 26C of the upper reinforcing body 10C. By this fixing, the overlapping region G2 is provided along the long direction of the long box 2.

As described above, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. For the joining, spot welding at welding points P9 and P10 is used.

Similarly to the first embodiment, the three-point bending collision analysis of the second embodiment was performed using finite element method analysis software (trade name: PAM-CRASH 64-Bit Solvers 2012. 1). In the three-point bending collision analysis, as shown in FIG. 3, a collision load L was applied to the long front plate 3 at the center A in the long direction of the long box 2.

According to the analysis result, in the cross section cut at the longitudinal center A (that is, the line BB in FIG. 1) of the long box body 2, when the amount of deformation becomes the maximum, as shown in FIG. Furthermore, a portion 29 of the upper surface 5 of the long box 2 that faces the upper surface 24 of the upper reinforcing body 10C is deformed inside the long box 2 and abuts on the upper surface 24 of the upper reinforcing body 10C. Yes. A portion 30 of the lower surface 6 of the long box 2 facing the lower surface 25 of the lower reinforcing body 10D is deformed inside the long box 2 and is in contact with the lower surface 25 of the lower reinforcing body 10D. Yes. On the other hand, the upper surface 24 of the upper reinforcing body 10C and the lower surface 25 of the lower reinforcing body 10D are less deformed in the vertical direction.

As shown in FIG. 11, in the second embodiment, the load [kN] increases in proportion up to the second predetermined deformation amount [mm], and when the second predetermined deformation amount [mm] is exceeded, The load [kN] is substantially constant. Therefore, the energy absorption amount [kJ] increases so as to be approximately linearly proportional to the deformation amount [mm].

[4. Comparative example]
Next, a comparative example will be described. In the bumper reinforcement 1 of the comparative example, similarly to the first embodiment and the second embodiment, it has a curved shape in which both ends in the longitudinal direction are retreated, and the long box body 2 and the long front plate 3 are Provided (see FIGS. 1 to 3). The long box 2 and the long front plate 3 are made of steel. However, unlike the first and second embodiments, the reinforcing body 10 is not installed in the elongated box 2.

In the comparative example, as shown in FIG. 12, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box body 2. For the joining, spot welding at welding points P11 and P12 is used. *

In the same manner as in the first and second embodiments, a three-point bending collision analysis of a comparative example was performed using finite element method analysis software (trade name: PAM-CRASH 64-Bit Solvers 2012. 1). In the three-point bending collision analysis, as shown in FIG. 3, a collision load L was applied to the long front plate 3 at the center A in the long direction of the long box 2.

According to the analysis result, in the cross section cut at the longitudinal center A of the long box 2 (that is, the line BB in FIG. 1), when the amount of deformation becomes maximum, as shown in FIG. Moreover, the upper surface 5 and the lower surface 6 of the long box body 2 are greatly deformed inside the long box body 2 in the vicinity of the opening front surface 9 of the long box body 2. Between the upper surface 5 and the lower surface 6 of the long box 2 narrowed by the deformation, the long front plate 3 bites into the long box 2 and is greatly deformed.

[5. Comparison of analysis results]
The analysis result of 1st Embodiment or 2nd Embodiment is compared with the analysis result of a comparative example. As shown in FIG. 14, the peak load per mass is larger in the first embodiment and the second embodiment than in the comparative example. As shown in FIG. 15, the amount of energy absorption per mass is much larger in the first embodiment and the second embodiment than in the comparative example. 14 and 15, the values calculated using the mass of the bumper reinforcement 1 according to each embodiment are compared.

Thus, the peak load per mass and the energy absorption amount per mass are improved in the first embodiment and the second embodiment compared to the comparative example. The reason is that in the comparative example, stress concentrates in the vicinity of the center A in the longitudinal direction of the long box 2, while in the first and second embodiments, the longitudinal direction of the long box 2 The stress is dispersed throughout the three-point bending region including the center A.

[6. Summary]
As described above in detail, in the bumper reinforcement 1 according to the first embodiment or the second embodiment, the opening front surface 9 of the elongated box 2 is opened, while the upper flange of the elongated box 2 is opened. The long front plate 3 is joined to the lower flange 8 and the lower flange 8 by spot welding. Accordingly, the bumper reinforcement 1 according to the first embodiment or the second embodiment has a so-called reverse hat type closed cross-sectional shape.

Furthermore, the bumper reinforcement 1 according to the first embodiment includes an upper reinforcing body 10 A and a lower reinforcing body 10 B installed in the long box 2 at the center A in the long direction of the long box 2. ing. The upper rear surface 21A of the upper reinforcing body 10A and the lower rear surface 21B of the lower reinforcing body 10B are opposed to the rear surface 4 of the long box body 2, and the long box body is formed by spot welding at the welding points P1 and P3. 2 is fixed to the rear surface 4. The upper side of the upper inclined surface 22 of the upper reinforcing body 10 A is located in the vicinity of the upper surface 5 of the long box 2. The lower side of the lower inclined surface 23 of the lower reinforcing body 10B is located in the vicinity of the lower surface 6 of the elongated box 2. The upper surface 24 of the upper reinforcing body 10 A faces the upper surface 5 of the long box 2 in the vicinity of the upper surface 5 of the long box 2. The lower surface 25 of the lower reinforcing body 10 B faces the lower surface 6 of the long box 2 in the vicinity of the lower surface 6 of the long box 2. The upper front surface 26A of the upper reinforcing body 10A and the lower front surface 26B of the lower reinforcing body 10B oppose the long front plate 3 and are fixed to the long front plate 3 by spot welding at the welding points P2 and P4. Is done. That is, the upper reinforcing body 10 A and the lower reinforcing body 10 B constituting the reinforcing body 10 are fixed to the rear surface 4 and the long front plate 3 of the long box body 2.

Furthermore, the bumper reinforcement 1 according to the second embodiment includes an upper reinforcing body 10 C and a lower reinforcing body 10 D provided in the long box 2 at the center A in the long direction of the long box 2. ing. The upper rear surface 21C of the upper reinforcing body 10C and the lower rear surface 21D of the lower reinforcing body 10D are opposed to the rear surface 4 of the long box body 2, and the long box body 2 is spot-welded at the welding point P7. Fixed to the rear surface 4. The upper side of the upper inclined surface 22 of the upper reinforcing body 10 C is located in the vicinity of the upper surface 5 of the long box 2. The lower side of the lower inclined surface 23 of the lower reinforcing body 10D is located in the vicinity of the lower surface 6 of the elongated box 2. The upper surface 24 of the upper reinforcing body 10 C faces the upper surface 5 of the long box body 2 in the vicinity of the upper surface 5 of the long box body 2. The lower surface 25 of the lower reinforcing body 10 D faces the lower surface 6 of the long box 2 in the vicinity of the lower surface 6 of the long box 2. The upper front surface 26C of the upper reinforcing body 10C and the lower front surface 26D of the lower reinforcing body 10D are opposed to the long front plate 3 and are fixed to the long front plate 3 by spot welding at the welding point P8. . That is, the upper reinforcing body 10 C and the lower reinforcing body 10 D constituting the reinforcing body 10 are fixed to the rear surface 4 and the long front plate 3 of the long box body 2.

With such a configuration, when a collision occurs in the long front plate 3 at the center A in the long direction of the long box body 2 (three-point bending collision analysis result), the upper surface 5 of the long box body 2. Of the top and bottom surfaces 6, the

portions

27, 28, 29, and 30 located in the vicinity of the top surface 24 of the upper reinforcement bodies 10 A and 10 C and the bottom surface 25 of the lower reinforcement bodies 10 B and 10 D As soon as deformation starts from the face plate 3 side to the inside of the elongated box body 2, it comes into contact with the upper surface 24 of the upper reinforcing

bodies

10A and 10C and the lower surface 25 of the lower reinforcing

bodies

10B and 10D. That is, at the center A in the longitudinal direction of the long box 2, the upper surface 5 and the lower surface 6 of the long box 2 start to deform from the long front plate 3 side to the inside of the long box 2. However, since the inner deformation is inhibited by the upper surface 24 of the

upper reinforcement bodies

10A and 10C and the lower surface 25 of the

lower reinforcement bodies

10B and 10D at the same time as the start, the cross-sectional collapse is suppressed. Therefore, the bumper reinforcement 1 according to the first embodiment or the second embodiment improves the peak load and the energy absorption amount per unit mass by suppressing the collapse of the cross section of the so-called reverse hat type closed cross section. Is possible.

In the bumper reinforcement 1 according to the first embodiment or the second embodiment, the reinforcing body 10 includes upper reinforcing

bodies

10A and 10C and lower reinforcing

bodies

10B and 10D. The upper reinforcing

bodies

10A and 10C have upper rear faces 21A and 21C, an upper inclined face 22, an upper face 24, and upper front faces 26A and 26C, and the lower reinforcing

bodies

10B and 10D have lower rear faces 21B and 21D. The lower inclined surface 23, the lower surface 25, and the lower

front surfaces

26B and 26D. With such a configuration, the upper reinforcement body 10A and the lower reinforcement body 10B included in the bumper reinforcement 1 according to the first embodiment are symmetrical, and the upper reinforcement body included in the bumper reinforcement 1 according to the second embodiment. The body 10C and the lower reinforcing body 10D are symmetrical. Therefore, in the bumper reinforcement 1 according to the first embodiment, the upper reinforcing body 10A and the lower reinforcing body 10B constituting the reinforcing body 10 can be formed in the same shape, and in the bumper reinforcement 1 according to the second embodiment. Since the upper reinforcing body 10C and the lower reinforcing body 10D constituting the reinforcing body 10 can be formed in the same shape, it is easy to manufacture the reinforcing body 10 that is a press-formed product, and the manufacturing cost can be reduced.

[7. Third Embodiment]
Next, a third embodiment will be described. In the third embodiment, as shown in FIG. 16, a hollow reinforcing body 10 E is installed in the long box 2 as the reinforcing body 10 at the center A in the long direction of the long box 2. .

As shown in FIGS. 16 and 17, the cavity reinforcing body 10 E is a cylindrical cavity body, and includes a rear surface 21, an upper inclined surface 22, a lower inclined surface 23, an upper surface 24, a lower surface 25, and a front surface 26. .

In the hollow reinforcing body 10E, the upper inclined surface 22 extends obliquely upward from the upper side of the rear surface 21. A lower inclined surface 23 extends obliquely downward from the lower side of the rear surface 21. The upper surface 24 extends from the upper side of the upper inclined surface 22. A lower surface 25 extends from the lower side of the lower inclined surface 23 and is provided to face the upper surface 24. A front surface 26 extends from the upper surface 24 and the lower surface 25. *

That is, the front surface 26 of the cavity reinforcing body 10 E extends from the front side of the upper surface 24 toward the lower surface 25 and extends from the front side of the lower surface 25 toward the upper surface 24.

As shown in FIG. 17, the rear surface 21 of the cavity reinforcing body 10 E faces the rear surface 4 of the long box body 2, and the rear surface 4 of the long box body 2 is spot-welded at the welding point P 13. Fixed. The upper side of the upper inclined surface 22 of the cavity reinforcing body 10E is located in the vicinity of the upper surface 5 of the elongated box 2. The lower side of the lower inclined surface 23 of the hollow reinforcing body 10E is located in the vicinity of the lower surface 6 of the elongated box 2. The upper surface 24 of the cavity reinforcing body 10 E faces the upper surface 5 of the long box body 2 in the vicinity of the upper surface 5 of the long box body 2. The lower surface 25 of the cavity reinforcing body 10 E faces the lower surface 6 of the long box 2 near the lower surface 6 of the long box 2. The front surface 26 of the cavity reinforcing body 10E faces the long front plate 3 and is fixed to the long front plate 3 by spot welding at the welding point P14.

As described above, the long front plate 3 is joined to the upper flange 7 and the lower flange 8 of the long box 2. For the joining, spot welding at welding points P15 and P16 is used.

In the bumper reinforcement 1 according to the third embodiment having such a configuration, the reinforcing body 10 (that is, the cavity reinforcing body 10E) is the same as the bumper reinforcement 1 according to the first embodiment or the second embodiment. Since it is fixed to the rear surface 4 and the long front plate 3 of the long box 2, the peak load and energy absorption per unit mass can be suppressed by suppressing the collapse of the so-called reverse hat type closed cross section. The amount can be improved.

The substantially upper half of the rear surface 21 of the cavity reinforcing body 10E corresponds to the upper rear surface 21A (see FIG. 5) of the first embodiment and the upper rear surface 21C (see FIG. 9) of the second embodiment. The substantially lower half of the rear surface 21 of the cavity reinforcing body 10E corresponds to the lower rear surface 21B (see FIG. 5) of the first embodiment and the lower rear surface 21D (see FIG. 9) of the second embodiment. The substantially upper half of the front surface 26 of the cavity reinforcing body 10E corresponds to the upper front surface 26A (see FIG. 5) of the first embodiment and the upper front surface 26C (see FIG. 9) of the second embodiment. The substantially lower half of the front surface 26 of the cavity reinforcing body 10E corresponds to the lower front surface 26B (see FIG. 5) of the first embodiment and the lower front surface 26D (see FIG. 9) of the second embodiment.

[8. Fourth Embodiment]
Next, a fourth embodiment will be described. 18 is a cross-sectional view of the long box body 2, the long front plate 3, and the solid reinforcing body 10F according to the fourth embodiment, taken along line CC or line DD in FIG. It is an assembly process figure of bumper reinforcement 1 concerning a 4th embodiment.

In the fourth embodiment, unlike the first to third embodiments, a solid reinforcing body 10F, which is a solid body made of synthetic resin, is used as the reinforcing body 10. The strength of the solid reinforcing body 10F is approximately the same as that of the long steel box 2 made of steel. Examples of the material of the solid reinforcing body 10F include polypropylene, and foam molding, glass fiber, or carbon fiber may be added thereto.

The outer shape of the solid reinforcing body 10F is the same as the outer shape of the cavity reinforcing body 10E of the third embodiment except for the following (see FIGS. 16 and 17). As shown in FIG. 18, the solid reinforcing body 10 F is provided with a pair of

clips

31 and 32 on the rear surface 21 and the front surface 26. The outer ends of the pair of

clips

31 and 32 are provided with elastically

deformable locking portions

31A and 32A, respectively. The pair of

clips

31 and 32 are provided at at least two locations along line DD in FIG. 3 in addition to the location along line CC in FIG. 3 showing the cut surface of solid reinforcing body 10F.

Around the clip 31, a foam member 33 is provided on the rear surface 21 of the solid reinforcing body 10F. Around the clip 32, a foam member 34 is provided on the front surface 26 of the solid reinforcing body 10F. The

foam members

33 and 34 are in an unfoamed state before the bumper reinforcement 1 according to the fourth embodiment is assembled, and at least from the line CC in FIG. 3 showing the cut surface of the solid reinforcing body 10F. They are provided continuously between the lines DD.

The rear surface 4 of the elongated box 2 is provided with a hole 35 into which the clip 31 is press-fitted. The holes 35 are provided in at least two locations along the line DD in FIG. 3 in addition to the location along the line CC in FIG. 3 showing the cut surface of the elongated box 2.

The long front plate 3 is provided with a hole 36 into which the clip 32 is press-fitted. The holes 36 are provided at at least two locations along line DD in FIG. 3 in addition to the location along line CC in FIG. 3 showing the cut surface of the elongated front plate 3.

In order to assemble the bumper reinforcement 1 according to the fourth embodiment, first, as shown in FIG. 18A, the solid reinforcing body 10 F extends from the front surface 9 of the long box 2 to the long box. After being put in the inside of the long box 2, the open front surface 9 of the long box 2 is closed by the long front plate 3.

When the solid reinforcing body 10F is put into the long box body 2, the engaging portion 31A of the clip 31 of the solid reinforcing body 10F is press-fitted into the hole 35 on the rear surface 4 of the long box body 2. . By this press-fitting, as shown in FIG. 18B, the engaging portion 31A of the clip 31 of the solid reinforcing body 10F is locked to the outside of the rear surface 4 of the long box body 2, so that the solid reinforcing body The body 10F is temporarily fixed to the rear surface 4 of the long box 2.

Thereafter, when the open front surface 9 of the long box 2 is closed by the long front plate 3, the locking portion 32 A of the clip 32 of the solid reinforcing body 10 F is press-fitted into the hole 36 of the long front plate 3. Is done. By this press-fitting, as shown in FIG. 18B, the locking portion 32A of the clip 32 of the solid reinforcing body 10F is locked to the outside of the long front plate 3, so that the long front plate 3 Is temporarily fixed to the solid reinforcing body 10F.

When the long box 2, the long front plate 3, and the solid reinforcing body 10 F are temporarily fixed, as shown in FIG. 18B, the long front plate 3 is the long box 2. The upper flange 7 and the lower flange 8 are joined. For the joining, spot welding at welding points P17 and P18 is used.

Then, when the elongated box 2 and the elongated front plate 3 are painted, the foamed

members

33 and 34 are foamed by heat due to the coating, as shown in FIG. The foamed foam member 33 is filled between the rear surface 21 of the solid reinforcing body 10F and the rear surface 4 of the elongated box 2. By this filling, the hole 35 on the rear surface 4 of the long box 2 is closed, and the engaging portion 31A of the clip 31 of the solid reinforcing body 10F is strongly pressed against the outside of the rear surface 4 of the long box 2. Therefore, the solid reinforcing body 10F is fixed to the rear surface 4 of the long box 2. Further, the foamed foam member 34 is filled between the front surface 26 of the solid reinforcing body 10F and the long front plate 3. By this filling, the hole 36 of the long front plate 3 is closed, and at the same time, the engaging portion 32A of the clip 32 of the solid reinforcing body 10F is strongly pressed to the outside of the long front plate 3, so The reinforcing body 10F is fixed to the long front plate 3.

In a state where the solid reinforcing body 10F is fixed to the rear surface 4 and the long front plate 3 of the long box 2, the relative length of the long box 2, the long front plate 3, and the solid reinforcing body 10F. The relative positional relationship is the same as the relative positional relationship among the elongated box 2, the elongated front plate 3, and the cavity reinforcing body 10E of the third embodiment.

In the fourth embodiment, instead of the

foam members

33 and 34, a foam sheet or an adhesive sheet may be used.

In the bumper reinforcement 1 according to the fourth embodiment assembled in this way, the solid reinforcing body 10F is a solid body made of synthetic resin, and the solid reinforcing body 10F is connected to the long box 2 and the long front. Since the burden of the work for assembling to the face plate 3 is reduced as compared with the spot welding of the first to third embodiments, the solid reinforcement is provided inside the closed cross section formed by the long box body 2 and the long front plate 3. The body 10F can be easily provided.

Further, in the bumper reinforcement 1 according to the fourth embodiment, the reinforcing body 10 (that is, the solid reinforcing body 10F) is a long box body in the same manner as the bumper reinforcement 1 according to the first to third embodiments. 2 is fixed to the rear surface 4 and the elongated front plate 3, so that the peak load per unit mass and the amount of energy absorption can be improved by suppressing the collapse of the so-called reverse hat type closed cross-sectional shape. Is possible.

In particular, in the bumper reinforcement 1 according to the fourth embodiment, the solid reinforcing body 10F is a solid body made of a synthetic resin and is difficult to be deformed. Therefore, the long box body at the time of a collision from the long front plate 3 is used. The effect of inhibiting the inner deformation of 2 is great.

[9. Others]
In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, the material of the long box 2, the long front plate 3, and the reinforcing body 10 (except the solid reinforcing body 10F of the fourth embodiment) is not limited to the use of steel, but bumper reinforcements. A material applicable to the ment 1 (for example, aluminum or CFRP (carbon fiber reinforced plastic)) is used.

For joint (welding) locations including the symbols P1 and P2, laser welding, arc welding, caulking, rivets, etc. are included in addition to spot welding.

DESCRIPTION OF SYMBOLS 1 Bumper reinforcement 2 Elongate box 3 Elongate front board 4 Rear surface of elongate box 5 Upper surface of elongate box 6 Lower surface of elongate box 7 Upper flange of elongate box 8 Lower flange 9 of long box body 9 Open front surface 10 of long box

body Reinforcing bodies

10A, 10C

Upper reinforcing bodies

10B, 10D Lower reinforcing body 10E Hollow reinforcing body 10F Solid reinforcing body 21 Rear surface of hollow reinforcing body, Rear surfaces 21A, 21C of the solid reinforcing body Upper rear surfaces 21B, 21D of the upper reinforcing body Lower rear surface 22 of the lower reinforcing body Upper inclined surface of the upper reinforcing body, upper inclined surface of the hollow reinforcing body, upper inclined surface of the solid reinforcing body Surface 23 Lower inclined surface of lower reinforcing body, lower inclined surface of hollow reinforcing body, lower inclined surface 24 of solid reinforcing body Upper surface of upper reinforcing body, upper surface of hollow reinforcing body, upper surface 25 of solid reinforcing body Lower surface of lower reinforcing body, lower surface of hollow reinforcing body, lower surface of solid reinforcing body 26 Front of the strong body, in front 26A, the upper front 26B of 26C upper reinforcement, the longitudinal direction center of the lower front A elongate box member 26D lower reinforcement of the actual reinforcement

Claims

A reinforcing body is provided inside the closed cross section formed from the long box and the long front plate,
A bumper reinforcement installed in a direction in which the long front plate side is a load input side,
The reinforcing body is provided so as to face and oppose the first upper surface, the first lower surface, the first rear surface, and the long front plate of the long box,
A bumper reinforcement that is fixed to at least the first rear surface of the elongated box and the elongated front plate.
The bumper reinforcement according to claim 1,
The elongated box is
The first front surface covered with the long front plate is opened, and extends from the first rear surface facing the first front surface toward the first front surface from above the first rear surface. The first upper surface, the first lower surface extending from the lower side of the first rear surface toward the first front surface and facing the first upper surface, and the first upper surface, A first upper flange extending upward from the first front surface side; and a first lower flange extending downward from the first front surface side of the first lower surface;
The long front plate is
Fixing the first upper flange and the first lower flange of the elongated box,
The reinforcing body is
A second rear surface, an upper inclined surface extending obliquely upward from the upper side of the second rear surface, a lower inclined surface extending obliquely downward from the lower side of the second rear surface, A second upper surface extending from the upper side of the upper inclined surface, a second lower surface extending from the lower side of the lower inclined surface and provided opposite to the second upper surface, and A second front surface extending from the front side toward the second lower surface and extending from the front side of the second lower surface toward the second upper surface, the longitudinal center of the elongated box body In the long box body,
The second rear surface of the reinforcing body is fixed to the first rear surface of the elongated box while facing the first rear surface of the elongated box.
The second upper surface of the reinforcing body is opposed to the first upper surface of the elongated box in the vicinity of the first upper surface of the elongated box,
The second lower surface of the reinforcing body is opposed to the first lower surface of the elongated box in the vicinity of the first lower surface of the elongated box,
The bumper reinforcement is characterized in that the second front surface of the reinforcing body faces the long front plate and is fixed to the long front plate.
The bumper reinforcement according to claim 2,
The reinforcing body is composed of an upper reinforcing body and a lower reinforcing body,
The upper reinforcing body includes an upper second rear surface corresponding to a substantially upper half of the second rear surface, the upper inclined surface, the second upper surface, and an upper second front surface corresponding to a substantially upper half of the second front surface. Have
The lower reinforcing body includes a lower second rear surface corresponding to a substantially lower half of the second rear surface, a lower inclined surface, the second lower surface, and a lower lower surface corresponding to a substantially lower half of the second front surface. Side second front surface,
The upper second rear surface of the upper reinforcing body and the lower second rear surface of the lower reinforcing body are fixed to the first rear surface of the elongated box,
The bumper reinforcement, wherein the upper second front surface of the upper reinforcing body and the lower second front surface of the lower reinforcing body are fixed to the elongated front plate.
The bumper reinforcement according to claim 2,
The bumper reinforcement, wherein the reinforcing body is a solid body made of synthetic resin.